Machine for forming metal bands



Oct. 35, 192? E. WIDELL 1,

MACHINE FOR FORMIfiG METAL BANDS File y 1923 12 Sheets-Sheet .1

INVENTOR.

BY M, W ATTORNEYS Oct. 15, 1929. M. E. WIDELL 1,731,478

MACHINE FOR FORMING METAL BANDS Filed Ma 5, 1925 12 Sheets-Sheet 2 INVENTQR.

B M M Oct. 15, 1929. M. E. WIDELL 1,731 ,478

IACHINE FOR FORMING METAL BANDS Filed May 5, 1923 12 sheets-sheet 5 INVENTOR.

BY Mp4? M, W ATTORNE Y5 Oct. 15, 1929. M. E. wmsu. 133L 78 MACHINE FOR FORMING METAL BANDS Filed May 5, 1923 12 Sheets-Sheet 4 BY M ATTORNEYS Oct. '15, 1929. EQWIDELL 7 CHINE FOR FORMING METAL BANDS Filed May 3, 1925 12 Sheets-Sheet 5 Zfz'g 5 J7 5; w //f v 4 ZZZ/ W INVENTOR.

' A TTORNE Y5 Oct. 15, 1929. M, E, WIDELL j 731,478 1 MACHINE FOR FORMING METAL BANDS Filed May 3, 1923 12 Sheets-Sheet 6 fig: 8 a! TWIIIIH 74.7w INVENTOR.

BY W Mv- W ATTORNEYS 0d. 15, 1929. w D 1,73i,478

.IAGHINE FOR FORMING METAL BANDS Filed May 1923 IZSheej s-Sheat 8 5 fim.

BY ATTORNEYS Oct" 15,1929..

E. WIDELL H ACHINE FOR FORMING METAL BANDS Filgd May 3, 1923 12 Sheets-She et 9 III/III,

W 1 -5 as A A4. 1% M? a 2 4 W744 5. MM

2f: zizfi Y 7 INVENTOR. I 222 BY 6M1- TTORME Y5 Get 15, 1929, M. E. WIDELL 1,731,473

IAGH'INE FORMING METAL BANDS Filed May s, 1923 12 Sheets-Sheet 1o INVENTOR. BY OZ 4 v :4 i ATTORNEYS Oct. 15, 1929. M. E. WIDELL ucmim FOR FORMING METAL mums Filed May 3, 1923 :12 Sheets-Sheet l1 11v Val-170R. .644,

A TTORNE Y5 Oct. 15, 1929.- M. E. WIDELL 1,731,478

IACHINE FOR FORMING METAL BANDS Filed May a, 1923 12 Shet-Sheet 12 II/1111114 1 "IIIIIIIIIJ "IIIIIIIIJ'IIIII/ INVENTOR.

BY W W ATTORNEYS 7111111111 "will/III];

Patented Oct. 15, 1929 UNITED sTATss PATENT; OFFICE MAGNUS E. WIDELL, OF CINCINNATI, OHIO, ASSIGNOR TO AMERICAN CAN COMPANY, OF NEW YORK, N. "Y., A CORPORATION OF NEWQ'ERSEY MACHINE ron FOBMING ETAL BANDS Application filed May 3, 1923. Serial No. 636,338.

A principal object of the invention is the provision of an eflicient organized machine for this purpose in which the various operating parts are so related and actuated as to render possible a veryhigh rate of production.

Another and very important object is the provision, in a machine of this character, of

automatically acting devices for punching and riveting together the overlapped ends of a metal strip to form a continuous and properly sized band, or collar, for the purpose specified.

Still another object is the provision of means operating upon the metal strips of.

which the bands are formed, during their normal course through the machine, for straightening said strips and removing therefrom such burs, or irregularities, as might be formed by the cutting operation.

An additional object is the provision of devices also operating upon the strips in their normal course through the machine for turning, or fianging, the edges thereof to produce finished bands of form which will facilitate the assembly thereof with the can bodies. I

The invention also has in view the correlation of the feeding and operating parts of the mechanism whereby the blanks and strips.

are delivered in exact timed relationship with respect to the cutting and forming operations and immediately released and removed after completion of said operations.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

Referring to the drawings,

Figure 1 is a front elevation of the machine oi my invention, partially broken away to illustrate certain of the operating mechanism Fig. 2 is a side elevation, also broken away for convenience in illustration;

Fig. 3 is a rear elevation in which certain 01"" the exterior parts are broken. away to show details of the mechanism;

Fig. 4: is a broken side elevation taken from the side opposite that shown in Fig. 2;

Fig.5 is a transverse section, taken substantially on the line 5-5 in Fig. 2; V

v Fig. 6 is an enlarged fragmentary view of the blank cutting elements, being taken substantially on the section line 6-6 in Fig. 3;

. Fig. 7 is a similar view, showing the parts in their relationship after completion of the cutting operation;

Fig. 8 is an enlarged sectional view, taken along the broken line 8-8 inFig. 2 and illustrating' in detail the relationship of the straightening and forming rollers;

Fig. 9 is a detail View of the bearing cages the roller bearings and adjusting means, this view being taken substantially on the line a 9 of Fig. 13;

Fig. 10 is an enlarged transverse section of the mandrel, taken uponthe section line 10-10 in Fig. 2;

Fig. 11 is an enlarged sectional view of the sheet-feeding mechanism, taken along the broken line 1111 of Fig. 3;

Fig.12 is a sectional detail, showing the forming and flanging rollers, being taken substantially on the line 1212 in Fig. 8;

Fig. 13 is a similar view, showing the straightening rollers, being taken substantially on the line 13-43 in Fig. 8;

Fig. 14 is an enlarged section through the expanding end of the mandrel, showing also the banclclamping mechanism in partial side elevation, being taken substantially on the line 14--14 in Fig. 2;

Fig. 15 is a sectional view of the actuating means for the mandrel expanding mechanism, being taken substantially on the line 15'15 in Fig. 3;

Fig. 16 is a similar view of the actuating means for the mechanism whereby-the blanks -vation and illustrating the actuating cam and yoke for the sheet cutting elements;

Fig. 18 is an enlarged partial longitudinal section, showing the band punching and riveting mechanism and the horn expanding means, being taken substantially on the line a retaining plate 33 and formed in brackets 1818 in Fig. 3;

Figs. 19, 20 and 21 are detail sections showing the punching and riveting elements in the several positions assumed in the operation thereof;

Fig. 22 is a plan View of the cam sha ft and associated mechanism, being taken substantially on the line 2222 in Fig. 2;

Fig. 23 is an elevational view of the cam and; operating levers for the band clamping wings;

. Fig. 24 is an enlarged sectional detail of the means whereby the bands are retained in advance position upon the mandrel during backward reciprocation of the feeding means, being taken substantially on the line 24-24 in Fig. 1-0;

Fig. 25 is a perspective view of the completed band as it is ejected from the machine;

' Fig. 26 is an enlarged sectional detail, taken on the line 26-26 in Fig. 25 and showing the final form of the metal rivets by which the band ends are joined together; and

Fig. 27 is a horizontal section, taken through the expanding end of the mandrel, substantially on the section line 27-27 in Fig. 14.

The machine as thus illustrated is adapted for the successive performance of feeding and forming operations, which result in the production, from a metal sheet, of completed bands, or collars, 21, shown in detail in Figs. 25 and 26. The mechanismis supported upon a frame 22, which is provided with a horizontal upper table portion 23. Power is supplied from any suitable source, through the medium of a pulley 24, to a power shaft 25, which latter has bearings 26 and 27 in the frame and is gear connected to a main cam shaft 28 by means of a pinion 29 and a gear 31, secured respectively on said shafts. (See Figs. 3 and 5.)

scribed by reference" to the successive operations performed thereby, the first of which is the feeding of a metal sheet to position in which a band forming strip is cut therefrom, and, in this connection, attention. is called particularly to Figs. 1 and 11. The sheets, indicated by the reference character 32, are manually placed in vertical position against 34 projecting upwardly from the table 23 to which'they are secured by means of bolts 35.

nvanave The sheet is held in posit-ion against the plate 33 by means of end bars 36 and 37 in which are provided grooves, or slots 38 and 39. The bar 37 is adjustable transversely of the plate 33 to vary the distance between the grooves 38 and 39 for accommodation of sheets of different width. Movement of said bar 37 from,

one position to another is accomplished by means of an adjusting screw 41 having a bear; ing in a bracket 42 on the frame bracket 34 and threaded through a block 43 (Fig. 11) positioned in a guideway 44 formed in the plate 33. Said block 43 is secured to the bar 37 by means of a stud. 45 and a clamping nut 46, which latter may be tightened to hold said bar 37 in adjusted position by drawing the block 43 tightly against shoulders 47 in the guideway 44. The screw 41 is operated by -a thumb-nut 48, and it will be manifest that the construction just described permits the positioning of the adjustable bar 37 at any point within the limit of the screw 41. Supporting rods 49 are provided at the upper side of the plate 33 and form extensions of the'latter to mechanism to be hereinafter described and at certain stages in the operation of said cutting mechanism, it is necessary to move said sheet downwardly, for which purpose I provide devices to be now described.

A rock shaft 53 is held in bearings 54 and 55 in the bars 36 and 37, respectively, and has clamping arms 56, rigidly secured thereto. Said shaft 53 is operated in a manner which will be presently explained, and the, clamping arms 56 serve to hold the sheet in proper vertical position during the operation of the cutting mechanism. After a strip has been out, the sheet is positively moved downwardly, by means of feeding rollers 57 mounted on a shaft 58, which also has bearings in the bars 36 and 37, as indicated at 59 and 61. Said shaft 58 is provided with a sheave 62 at. one end thereof and is continuously driven from the power shaft 25 by The mechanism may, perhaps, be best demeans of a belt 63, taking over said sheave 62, and a sheave 64 on the shaft 25. The ends of the shafts 53 and 58 are connected by a bearing member 65, as shown at the left in Fig. 1. The rollers 57 are slidably mounted on the shaft 58, which permits adjustment of position in accordance with the position of the adjusting bar 37. The shaft 53 is rocked to clamp the sheet 32 against the plate 33 by mechanism illustrated at the left in Fig. 1 and consisting of an arm 66 on said shaft 53, which arm is connected with and VVith an arm 71 in desired position, 'a lower bears against a butpin 74, which carries idle roller 75 adapted projection 72 thereon ton 73 upon a sliding at its opposite end an -to cooperate with the roller 57 to feed a sheet downwardly. It will be noted that said roller 75 is normally retracted, by means of a spring 76 hearing againstthe button 73. -When the rock shafts 53 and 69 are rotated in such manner as to relieve the pres-- sure of the arm 56 from a sheet 32, said roller 75 is forced against the tension of the spring 76 to position engaging the sheet opposite the feeding roll 57. When the sheet is thus forced against the continuously rotating feeding roller, it is fed downwardly into. position for another cut and the rock shafts 53 and 69 are then rotated in opposite direction to permit retraction of the roller 75 and to cause the clamping arms 56 to clamp the sheet against the retaining plate 33.

The downward feeding of the sheets, as has been heretofore stated, is controlled by the operation of the cutting mechanism, which is illustrated in'detail in-Figs. 6 and 7 and the operation'of which may be understood by viewing Figs. 1, 41 and 17. Said cutting mechanism comprises a blade, or shearing die, 77, secured in a slide 78 and cooperating with a fixed shearing die 79 secured to thebottom of the retaining plate 33. Said slide 78 moves in suitable guideways 81, formed in the upper part of the table 23, and is adapted to be reciprocated by means of a cam 82 mounted on the cam shaft 28 and operatively connected with-said slide by means of a connecting rod '83 carrying a cam yoke provided with a roller 85 following an eccentric groove 86 in said cam 82, said. connecting rod being secured at its opposite end to an arm tegral arm 87 formed integrally with a sleeve 88 mounted on a short shaft 89 and having also an upwardly extending incured to said slide 78. Said shaft/89 has bearings in brackets 93 depending from the underside of the table 23. It will be noted that there are two of the arms 91- uponthe sleeve '88, these being similarly connected to the feed slide 78.

Referring particularly to Fig. 7, the actionof the cutting or shearing dies will be clearly understood. A strip 94 is cut and forced from the position shown in dotted lines in said figure to the position shown in lines, in which it full is positioned horizontally upon a feed slide 95 having a dove-tail confer of the severed, strips station to straightening and forming rollers 91 connecting with a link 92 senection. 96 with a bracket 97 projecting upwardly from the tablef23. The lower edge of the sheet, prior to the shearing operation, is held between studs 98 and projecting points 99 on the slide 95 and, afterseverance, the strip is positioned before a stud 101 projecting .upwardly from the bed of said slide 95. The tops of the studs 98 are slightly inclined, as illustrated in Figs. 6 and 7, to insure the strip 94 reaching a horizontal position upon the upper surface of said slide 95. A stop wall 102 is also formed in the feed slide and terves to prevent accidental displacement of the strip from its horizontal position.

Prior to a description of the operation of the feed slide 95, it should be pointed out that the cutting slide 78 is connected by an upwardly projecting arm 103 with the lever arm 66 and link 67' by which the rock shafts 53 and 69 are rotated. A spring connection between these parts is provided by means of a spring 104 positioned upon a stud 105, which connects said arm 103 with said arm 66 and link 67. This spring connection takes up any shocks which might otherwise result from the positively moving cutting slide 7 8. 4

The next step in the operation is the transfrom the cutting by which they are accurately shaped, preparatory to being positioned upon a forming mandrel. The transfer v mechanism is, perhaps, best illustrated in Figs. 3, 4 and 5. The slide 95 is provided at one end with a bracket 106, which is connected by a link 107 with an arm 108 secured upon a rock shaft 109, having bearings at one end in a bracket 111 secured to the lower surface of the frame 22 and at the opposite end in the frame itself. Said shaft carries a downwardly projecting lever arm 112, which, at its lower end, is provided with a camfollowing roller 113, which is acted upon by a cam groove 114: in a cam 115 carried by the 'cam shaft 28. "The slide 95 is reciprocated the mechanism ust described to deliver the strips to the straightening and forming rollers, which are illustrated in detail in Figs. 8, 12 and 13. I

Referring first to the straightening rollers, it will lower flanged roller 116 and an upper straight roller 117, the latter being idle and the former being driven by means of a gear 118, meshing with a roll driving gear 119 carricd upon a shaft 121. (See Fig. 5.)

Friction of the strip uponthe roller 117 rotates the latter and the strip is advanced between side flanges 122 on the roller 116, being thus straightened and having removed therefrom any burs which may have been formed by the cutting operation. -The strip is directed from the rollers 116 and 117 over he noted that they constitute a a support 123 and between forming rollers 124 and 125, the construction of these rollers being shown particularly in Fig. 12. The roller 124 is provided withside flanges 126,

j which are beveled on their inner sides, and

the roller 125 is somewhat rounded at its edges, as indicated at 127 to cooperate with the flanges 126 to slightly turn, or curl, the the strip edges 128, as shown in detail in Fig. 26. Said rollers 124 and 125 are geared together by gears 129 and 131, which latter is driven by the gear 119. The shaft 121, carrying the gear 119, has bearings 1.20 in the table 23 and is driven by means of a sprocket chain 132 taking over a sprocket 133 upon said shaft and over a sprocket 134 on a shaft 135 carried in brackets 136 and 137 depending from the underside of the frame. Said shaft 135 is continuously rotated by means of bevel gears 138 and 139, the latter of which is mounted upon the drive shaft 25. A clutch, generally indicated by the reference-characfor 141, is provided at the end of the shaft 135 to prevent damage to the operating parts of the machine in the event that the feeding rollers should, for any reasoinbe held against rotation. This clutch comprises a spring 142, held between a collar 143 and the face of the sprocket 134, and is adapted topermit slipping of the shaft within said sprocket should the sprocket beheld against rotation.

The rollers 116 and 117 are formed inte-' brackets 148.

Referring now to Fig. 12, it will be noted that the rollers 124 and 125 are mountedin manner similar to the rollers 116 and 117, the shafts 152 and 15.3 being provided with bearings,154, positioned in brackets 155 and vertically adjustable 'by lneans of ad usting screws 156. Lateral adjustment of the roller 124 may be accomplished by means of screws 157, corresponding to the screws151.

As the strip is fed through the Hanging rollers 124 and 125, it is directed against a'defleeting plate 158, secured by means of a screw 159 to an insert 160 fixed to the table 23. The forward edge of said plate is rounded, as indicatcd at 161, and serves to direct the strip into a shell 162 and about the end of an elongated circular mandrel 163. 'It will be noted that the mandrel 163 is cut away at 164 at one end to permit the rollers 124 and 125 to be positioned as shown in Figs. 8 and 12, so that said rollers serve to feed the strip 94 onto said mandrel, as well as to flange said strip.

The strips, after being brought to cylindrical form upon the mandrel 163, are advanced with an intermittent motion along saidmandrel bymeans of feeding devices, which will next be described.

In this connection, attention isealled particularly to Figs. 2, 10 and 16. Four feed bars 165 are positioned in the side of the mandrel 163' and are provided with spring dogs 166- adapted to engage behind the circular strip after it has been positioned upon the mandrel and to feed it with a step motion to a position at which the strip ends are joined together, as will be hereinafter described. The feed bars 165 are secured at one end to a disk 167, which is connected by a link 168 witha lever arm 169 mounted on a short shaft 171 secured in bearing brackets 172 and 173 depending from the underside of the table 23. Said lever arm 169 is formed integrally with a sleeve 174 mounted on said shaft 171 and having a depending arm 175 connected by a rod 176 with a cam yoke 177 provided with a cam following roller 178 acted upon by an eccen-- As the feed bars 165 are reciprocated by the mechanism just described, the dogs 166 advance the strip on the forward stroke and ride therebeneath on the backward stroke, since they are normally spring held outwardly and are shaped in such manner as to be depressed by contact with said strips when moved in rearward direction. The circular strips are held in advance position by means of retaining dogs 182, illustrated in detailin Figs. 10 and 24. Said dogs are mounted in channel bars 183, positioned about the mandrel, and

are normally projected by means of springs 184 secured by screws 185 to the bottom of said channel members 183 and bearing upon tail portions 180 of said dogs 182. Thesedogs are adapted to be depressed by contact with the advancing strips and to engage behind said strips upon the backward stroke of the feed bars, thus holding the strips in position to be again engaged by the spring dogs 166 on said feed bars for further advance.

The channel members 183 are four in number (Fig. 10) and are secured in arms 186,

which are pivoted upon studs 187 secured in brackets 188 on the upper surface 189 of a bracket 191. Each arm 186 is provided with a spring 192, which is positioned between, the outer surface of said arm and the bracket 188 being held in a recess 193 in the latter by means of a screw 194. This spring permits a yielding pressure of the dogs 182 upon the mandrel and the amount of this pressure isrendered constant by means of stop screws 195 threadedthrough the lower extremities of thearms 186 and bearing against the brackets 188. By this construction, the position of the channels 183 may be adjusted relative to the outer surface of the mandrel through variation of the tension on the springs 192. The

mandrel 163 is held in place upon the bracket surface 189 by means of a block 196 taking 1 into said bracket surface and the lower side of the mandrel and being held in place by means of screws 197. (See Figs. 2 and 10.) Hardened angle members 198 are provided upon an upward projection 199 on the bracket surface 189 and extend into recesses 201'in the sides of the block 196. These members form tracks for the strip ends as the strips'are moved alongthe mandrel. Theshell 162 is formed integrally with an end plate 202,

Y which latter is secured to the end of the mandrel by means of a screw 203- (See Fig. 12.) A clamping bar 204 is pivoted on a stud 205 projecting upwardly from the shell 162, a spring 206 being provided upon said stud 205 above an extension 207 of said bar 204, thus forming a yielding connection.

the mandrel and is intermittently brought into clamping position to hold the strips upon the mandrel, both at the idle stations and at a riveting station to be hereinafter described. The end of the mandrel, shown at the right in Figs. 2 and 18, is reduced in size-and is specially formed to hold the strips 94 in exact position as the edges thereof are overlapped and permanently joined together. Said reduced portion of the mandrel projects beyond the supporting block196 and is adapted to have the strip arranged thereon with the ends in overlapped relationship and in posi-' tion to be riveted together.

. The bar 204 is positively lowered to clamp the bands 94 upon the mandrel, by mechanism actuated from the cam shaft 28. Said mechanism is, perhaps, best illustrated in Figs. 2, 3,17 and 22,

and comprises a rod 209 connected by an arm 211 with a rod 212, which is secured to the forward end of the bar 204, said rod 209 being periodically reciprocated by means of an arm 213, which is secured upon and adapted to rock about a short auxiliary shaft 214. Said shaft is mounted in bearings 215 formed in'the frame 22. Said arm 213 is provided with a cam following roller 216, which is acted upon by acam 217 to reciprocate said rod 212 .and thereby periodically clamp the bar 204 upon the strips positioned upon the mandrel, It will be observed that a coil spring 218 is positioned on the upper end of the rod'212, toprovide a yielding connection with the rod 209, whereby obstruction of the downward movement of said rod 212 will not result in damaget'o the operating parts of the machine.

When the strips is positioned-upon the reduced end of the mandrel, as shown particu larly in Figs. 14 and 18 to 21, inclusive, its edges rest upon shoulders 219 and 221 formed in the said mandrel portion whereby displacement is prevented during the assembling operation. The bar 204 is, of course, clamped upon the top of. the strip during the assembling operations.

are overlapped by means of Said bar 204' extends substantially the entire length of connected by a rod 231 with a sliding crosshead 232 positioned in a slot 233 in a bearing box 234 at the end of the bracket 191. (See Figs. 3 and 18.) Said cross head is raised and lowered by the cam 217, through the instrumentality of a rod 235 pivotally connected to the arm 213. The wings 222 are held in such position as to operate in desired timed relationship and the difference in movement. is rendered possible by springs 236 positioned upon the lower ends of the actuating rods 231 beneath their connection with the cross head 232. Fig. 3 shows the wings 222 in fully expanded position and Fig. 14 shows the relative position of the different wings after one of them has been moved to clamping position. Upon the inward movement of the other wing, the opposite end of the strip 94 is caused to overlap the first clamped end and, in such position, the strip is ready to be perforated and riveted, as will now be described.

The mechanism whereby this operation is accomplished is, perhaps, best illustrated in Figs. 18 to 21, inclusive. Two piercing points 237 constituting a punching means are provided on the upper end of a slide 238, which is held within the bearing box 234, said slide being actuated through the instrumentality of a a cam 239 mounted on the cam shaft 28. The slide is operatively connected with this cam by means of a link 241, which is pivotally connected at its lower end to an arm 242 mounted. upon the shaft 214. Said arm carries a cam following roller 243, working in a groove 244 in-the cam 239. (See Figs. 2 and 22.) s 1 Prior to the operation of the slide 238, the

being mounted upon a stud forming the pivota1 connection 252 and riding upon the surface head 246 is lifted against the lapped ends of the strip just prior to the upward re'eiprocation of the slide 238, which carries the piercing points 237. Said points are then project arm 253 mounted on the shaft 214, a-roller 254 of said cam 217. By this mechanism, the g ed through the-lapped ends, displacing the metal and forcing it upwardly into the die block 245, which is apertured for this purpose. The slide 238 is then lowered, removing the piercing points and, at this time, the clamping head, or plate, 246 acts as a stripping member. (See Fig. 21.) The upwardly projecting metal is next clenched, or riveted, by means of riveting tools 255, carried by an extension 256 provided on the upper end of a slide 257, which is slidably mounted in the bearing box 234, inwardly of the slide 247. Said slide 257 is raised and lowered by means of a link 258 pivoted at 259 to the lower end of said slide and secured to a cam yoke 261, which straddles the cam shaft 28 and carries a roller 262 following a groove 263 in the face of the cam 217. By this mechanism, the riveting 'tools 255 are brought down against the metal adjacent the perforation formed by the piercing points 237.

Points 264 on said tools enter the perforations,

the metal being tightly clamped between said riveting tools and the clamping plate 246. In this manner, the metal is overturned and integral rivets 266 (shown clearly in Fig. 26) are formed. Upon completion of the riveting operation, the clamping parts 216 and 256 are moved to normal position and 4 the formed band is disengaged.

In order that said band may be removed from the mandrel, the reduced extension, identified by the reference character 267, is adapted to be collapsed by mechanism shown particularly in Figs. 14, 18 and 27. The collapsing of the mandrel "is partcularly necessary, in view of the flange shoulder formed on the band. A bar 268 extends through the mandrel 163 and through the extension 267.

and is adapted to be reciprocated by mechanism comprising a link 269, an arm 271 carried on a rock shaft 272 which has bearings in a bracket 273 and which carries a depending arm 27 {1 connected by a link 275 with a cam yoke 276 carrying a roller 277, riding in a groove 278 in a cam 27 9 on the shaft 28. (See Figs. 3, 5 and 15.) The mandrel extension 267 is formed of a central section 281 and of side wing sections 282 and 283. The central section 281 is secured by means of a stud 284 to the main mandrel 163 and the side wingsections 282 and 283 are adapted for slight lateral movement with respect to said central section 281. The rod 268 is provided with flat faces 285, normally disposed opposite studs 287 secured to the mandrel sections 282 and 283 by means of screws 288. Said studs,

in this position, hold the mandrel sections 282 and 283 in their outward position, completing a, true circle, as previously described. Upon reciprocation of the rod 268, however,

the studs are permitted to move inwardly, this being rendered possible by depressions 286 formed in said rod.- The inward move- .ment of the mandrel sections is accomplished by means of springs 289, which encircle studs 291, threaded at their inner ends into the central ortion 281 of the mandrel and extending through plates 292 secured by screws 293 to the inner sides of the mandrel sections 282 and 283. Said springs are confined between said plates 292 and heads 290 on said studs 291.

As thus mounted, the springs exert constant tension on the outerside of the plates 292, tending to, draw said mandrel sections 282 and 283 inwardly, this being permitted when the rod 268 is moved to position with the depressions 286 opposite the studs 287.

After the mandrel extension 267 has been collapsed by the foregoing mechanism, the formed band is removed by means of the spring dogs 166 on the feed bars 165 and discharged from the machine. The clamping bar 204 is raised to disengage the formed band and permit removal thereof from the grooves 219 and 221, by mechanism illustrated particularly in Figs. 2, 3 and 17. This ll'lOCll'tlIllSlfl comprises a link 294, connected'to the outer end of said bar'204 and at its upper end is connected to a lever 295 secured to a short shaft 296, having bearings in the yoke 227. An arm 297 is secured to the outer end of the shaft 296, and this arm is connected by a link 298 with a vertical lever 299, pivoted at 301 to a bracket 302 upon the frame and carrying, at its lower end, a cam roller 303 acting upon a cam track 304. formed'on the periphery of the cam 82.

It is thought that the invention andmany of its attendant advantages will be understood from theforegoing description, and it will be. apparent that various changes may be made in the form, construction and arrangement of the parts, without departing from the spirit and scope of the invention, or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim: a Y

1. A machine for forming metal bands, comprising means for cutting strips of desired size from metal sheets, a forming mandrel, means for arranging the severed strips upon said mandrel with their ends lapped, and means for punching ,Ian'd riveting the metal of the lapped strip ends together to form cylindrical metal bands.

2. A machine vfor forming metal bands, comprising means for cutting strips of desired size from metal sheets, a forming'mandrel, means for arranging the severed strips upon said mandrel with their ends lapped, and devices for forming integral metal rivets in the lapped strip ends to permanently join the latter.

3. A machine for forming metal bands, comprising means for cuttin strips of desired size from metal sheets, a orming mandrel, means for arranging the severed'strips upon said mandrel, means for overlapping theends of a strip, and devices for forming integral metal rivets in the overlapped strip ends to permanently join the lattcix. I

4. A machine for forming metal bands, comprising mechanism for cutting band strips from metal stock, a forming mandrel, means for arranging a strip upon said mandrel, intermittent feeding devices for moving the strip along said mandrehmeans for arrangingthe strip ends in overlapped relationship and forming a band of desired size, and

means for operating on and permanently joining said overlapped ends by punching and interlocking the metal thereof. 4

.'5.'A machine for'forming metal bands, comprising mechanism for cutting band strips from metal stock, including a transversely movable shearing element, a forming mandrel, means for arranging the severed strips upon said mandrel with their ends lapped, and means for punching and riveting the metal of the lapped strip ends together to form cylindrical metal bands.

6. A machine for forming metal bands, comprising mechanism for cutting band strips from metal stock, including a reciprocating shearing element and means for clamping the stock in fixed position prior to the operation of said element, a forming mandrel, means for arranging the severed strips upon said mandrel with their ends lapped, and means'for punching and riveting the metal of the lapped strip ends together to form cylindrical metal bands.

7. A machine for forming metal bands,

'comprising mechanism for cutting band strips from metal stock, a forming mandrel,

means for transferring the cut strips to saidmandrel, means for straightening said strips and removing burs therefrom during the transfer thereof to said mandrel, means for arranging the strips in desired positionupon strips from metal stock,

the mandrel, and means for punching and interlocking 'the metal of the opposite strip ends to form a continuous metal band.

8. A machine for forming metalhands, comprising mechanism for cutting. band a forming mandrel, means for transferring the cut strips to said mandrel, means for straightening said strips and removing burs therefrom during the transfer thereof to said mandrel, means for Hanging said strips and for positioning them upon said mandrel. and means for punching "and interlocking the metal of the opposite strip ends to form a continuous metal hand.

9. A machine for forming metal bands,

comprising mechanism for cutting hand strips from metal stock, a forming mandrel,

means for transferring the cut strips to said mandrel, means including flattening rollers for straightening said strips and removing burs therefrom during the transfer-thereof to said mandrel, means for arranging the strips in desired position upon the mandrel, and

means for punching and interlocking the metal of the opposite strip endst'o form a continuous metal band.

10. A machine for forming metal bands, comprising mechanism for cutting band strips from metal stock, a forming mandrel, means for transferring the cut strips to said mandrel, means for straightening saidstrips and removing burs therefrom during the transfer thereof to said mandrel, means including cooperating fianging rollers for turning the edges of said stripsand for positioning them 'upon said mandrel, and means'for punching ing integral metal rivets in said overlapped Y edges to permanently'lock the latter in desired relationship. v

12. A machine for forming metal bands, comprising a forming mandrel, means for wrapping a band forming strip upon said mandrel, means for clamping said strip upon a portion of the mandrel with the edges in overlapped relationship, means for punching the metal of the overlapped ed es, and means for overturning the punche -out metal to rivet the ends of the strip together. p

13. A machine for forming metal bands, comprising a forming mandrel, means for Wrapping a band forming strip upon said -mandrel, means for clamping said strip upon a portion of the mandrel with the edges in overlapped relationship, means for punching the metal of the overlapped edges, means for overturning the punched-out metal to rivet the ends of the strip together, and means for collapsing said mandrel at the forming station to permit removal of the formed band.

14:. In a machine for forming metal bands the combination of means for forming the band in circular form including a forming mandrel, means for expanding a portion of said mandrel, means for causing the metal band to encirclethe mandrel with its ends overlapped, and punching and rivetingand riveting means arranged to operate on the overlapped ends of the hand to securely unite them, and a plurality offeed barsins'erted and guided in the exterior part of the mandrel and disposed in a circular series around the mandrel.

- iso 16. In a machine for forming metal bands the combination of a forming mandrel, means for causing the metal band to encircle the mandrel With its ends overlapped, means for expanding a portion of the mandrel, and punching and riveting means arranged to operate on the overlapped ends of the band to securely unite them.

17. The combination of a fixed forming mandrel arranged horizontally, means'for coiling strips around said mandrel with their ends lapped, means for feeding the coiled. strips one after the other along said mandrelto be discharged at the end of the same, punching and riveting means operatmg on the lapped ends of said strips, and

mechanism operating said coiling means and 'said feeding means and stud punching and riveting means in timed relation.

18. The combination of a fixed forming mandrel arranged horizontally, feeding rolls arranged near the mandrel for feeding strips endwise and coiling them around the mandrel and overlapping the ends of said. strips, means for feeding the coiled strips one after the other along said mandrel to be discl'iarged atthe end of the same, punching and riveting means operating on the lapped ends of said strips, and mechanism operating said rolls and said feeding means and said puncliing and riveting means in timed relation.

19. The combination of a fixed forming mandrel arranged horizontally, feeding rolls shaped to flange the longitudinal edges of metal strips and acting tofeed the flanged strips endwise around the mandrel and to coil them thereon, and to overlap the ends thereof, means for feeding the coiled strips one after the other along said mandrel to be discharged at the end of the same, punching and riveting means operating on the lapped ends of said strips, and mechanism operating said rolls and said feeding means and said punching and riveting means in timed relation.

v 20. In a machine for forming metalbands the combination of a forming mandrel, means including flanging rollers for causing the metal band to encircle the mandrel with its ends overlapped, means for expanding a portion of the mandrel, and punching and riveting means arranged to operate-on the overlapped. ends of the band to securely unite them. 7

- MAGNUS E. VVIDELL. 

